This report addresses the probable extent and severity of the fallout hazard associated with a massive hypothetical attack against an MPS Deployment of the MX missile in the Nevada Model Area. It contains descriptions of attack scenarios, site modeling, methodology for calculating and depicting the distribution of fallout, and quantitative estimates of the severity of the hazard. Forty separate wind samples taken over a twelve-month period are used to assess the variability of the distribution of fallout resulting from an attack of several thousand surface burst weapons at the Nevada site. Fallout intensities are determined at 177 monitor points throughout the potential deployment area; time histories of dose rate buildup and decay are presented and discussed with respect to operational implications. Key factors are parameterized to permit comparison of a range of design factors and logistical considerations. Key findings are presented in condensed form including several illustrative examples chosen to quantify the practical aspects of operating in a radiation environment and to assist in the development of a balanced system design.